Melo/test/library/category_service_test.dart

import 'package:drift/drift.dart' show Value;
import 'package:drift/native.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:melo/library/category_service.dart';
import 'package:melo/library/database.dart';

void main() {
  late MeloDb db;
  late CategoryService service;

  setUp(() => db = MeloDb(NativeDatabase.memory()));
  tearDown(() async {
    service.dispose();
    await db.close();
  });

  Future<void> insert(String id, {String? cover}) => db.upsertSongs([
        SongsCompanion.insert(
          id: id,
          path: '/$id.mp3',
          title: 'Song $id',
          coverPath: Value(cover),
          dateAddedMs: 0,
          updatedAtMs: 0,
        ),
      ]);

  Future<void> settle() => Future<void>.delayed(const Duration(milliseconds: 50));

  test('reicht die Kategorien eines Songs durch', () async {
    await insert('1');
    await db.setCategories('1', ['Rock', 'Pop']);
    service = CategoryService(db);
    await settle();

    expect(service.of('1'), ['Rock', 'Pop']);
    expect(service.of('unbekannt'), isEmpty);
  });

  test('Songs derselben Kategorie bekommen dasselbe Cover', () async {
    await insert('1', cover: null);
    await insert('2', cover: '/rock.img');
    await db.setCategories('1', ['Rock']);
    await db.setCategories('2', ['Rock']);
    service = CategoryService(db);
    await settle();

    final ohneCover = (await db.watchSongs().first).firstWhere((s) => s.id == '1');
    expect(service.coverFor(ohneCover, groupByCategory: true), '/rock.img');
    expect(service.coverFor(ohneCover, groupByCategory: false), isNull);
  });

  test('von Hand gesetzte Kategorien markieren den Song als bearbeitet',
      () async {
    await insert('1');
    service = CategoryService(db);
    await settle();

    await service.setCategories('1', ['Eigen']);
    await settle();

    expect(service.of('1'), ['Eigen']);
    expect((await db.watchSongs().first).single.categoriesEdited, isTrue);
  });
}